Issue #10951: Fix compiler warnings in timemodule.c and unicodeobject.c

Thanks Jérémy Anger for the fix.
diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index ad28e58..89a41ce 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -515,14 +515,18 @@
      * will be ahead of time...
      */
     for (i = 1024; ; i += i) {
+#if defined _MSC_VER && _MSC_VER >= 1400 && defined(__STDC_SECURE_LIB__)
         int err;
+#endif
         outbuf = (time_char *)PyMem_Malloc(i*sizeof(time_char));
         if (outbuf == NULL) {
             PyErr_NoMemory();
             break;
         }
         buflen = format_time(outbuf, i, fmt, &buf);
+#if defined _MSC_VER && _MSC_VER >= 1400 && defined(__STDC_SECURE_LIB__)
         err = errno;
+#endif
         if (buflen > 0 || i >= 256 * fmtlen) {
             /* If the buffer is 256 times as long as the format,
                it's probably not failing for lack of room!
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 3f70af7..f5f1c46 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -4832,7 +4832,7 @@
     if (maxchar < 128 && size == unicode_size) {
         if (consumed)
             *consumed = size;
-        return unicode_fromascii(s, size);
+        return unicode_fromascii((const unsigned char *)s, size);
     }
 
     unicode = PyUnicode_New(unicode_size, maxchar);